I found this documentation that may be helpful to you - https://confluence.atlassian.com/confkb/how-to-get-a-list-of-active-users-counting-towards-the-confluence-license-298978076.html
Basically you can run a query in the confluence DB and retrieve the number of users.
Hope it help you.
Atlassian licensing is not based on how many people are currently in the system. It is based on how many people are in the user directory with the "can use" permission applied. Even if no one is logged in your licenses are being consumed. Check out the links below for how Confluence licensing works.
I'm updating this old post as it has a lot of views, and we have a feature request now for the functionality, as it exists in Jira.
Have a look at this:
Please feel free to vote on the request if you are interested, since it will help show how helpful this would be to many users. You can watch the case as well if you want to be updated of any changes.
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